刚做的板子，想试验一下的可就是不能下载
注：有一套购买的试验板，可以下载，
相比之下，成功的和不成功的相差一条：* JLink Info: ETM fitted.
即：不成功的缺少这一条
JLink info:
------------
DLL: V4.15n, compiled Jun 18 2010 19:55:09
Firmware: J-Link ARM V8 compiled May 20 2010 17:07:46
Hardware: V8.00
S/N : 20100214
Feature(s) : RDI,FlashDL,FlashBP,JFlash,GDBFull
* JLink Info: TotalIRLen = 9, IRPrint = 0x0011
* JLink Info: Found Cortex-M3 r1p1, Little endian.
* JLink Info: TPIU fitted.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
**JLink Warning: Could not set S_RESET_ST
ROMTableAddr = 0xE00FF003
Target info:
------------
Device: STM32F103RB
VTarget = 3.254V
State of Pins:
TCK: 1, TDI: 0, TDO: 1, TMS: 0, TRES: 1, TRST: 1
* JLink Info: TotalIRLen = 9, IRPrint = 0x0011
* JLink Info: Found Cortex-M3 r1p1, Little endian.
* JLink Info: TPIU fitted.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
Hardware-Breakpoints: 6
Software-Breakpoints: 2048
Watchpoints: 4
JTAG speed: 2000 kHz
Erase Done.
Programming Failed!
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